How to Compress a Video for Email (Free, In Your Browser)
A one-minute video from a modern phone can easily be 100MB or more, while Gmail and Outlook cap attachments at 25MB. Compressing the video is usually a far better fix than switching to a file-transfer service, and it can now be done entirely in your browser.
Why phone videos are so large
Phones record at high resolution (often 4K) and high bitrate to preserve maximum quality for editing. But a video destined for an email attachment does not need editing headroom, it needs to be watchable, and a re-encode at 1080p with a tighter bitrate typically cuts the file size by 60 to 80 percent with little visible difference on a normal screen.
How to compress a video in your browser
- Open the Video Compressor tool.
- Drop your video file (MP4, MOV, MKV, WEBM and AVI all work).
- Pick a compression level: Medium is the recommended balance.
- The first use downloads the browser video engine (about 25MB, cached afterwards), then your video is re-encoded on your own device.
- Download the compressed MP4.
What is doing the work under the hood
The tool runs FFmpeg.wasm, a WebAssembly build of FFmpeg, the same open-source engine behind most professional video software, inside your browser tab. Your video is decoded and re-encoded locally: no upload, no queue, no server involved. The only thing that affects speed is your own device’s processing power, not your internet connection.
If compression alone is not enough
For a long video, consider trimming to the section that actually matters before compressing. A 30-second clip at moderate quality is far smaller than the entire five-minute video at any quality, and the Trim Video tool cuts without re-encoding, so it is instant.
Questions
Frequently asked
How much smaller will my video get?
Typical results shrink a video by 40 to 70 percent with a modest quality trade-off that is usually not noticeable at normal viewing size.
Why does the first compression take longer?
The first video tool you use downloads the browser video engine, about 25MB. Your browser caches it, so every use after that starts instantly.
Is my video uploaded to a server?
No. The entire re-encode happens inside your browser tab; the video never leaves your device.